SEOUL, South Korea — North Korea’s military warned Tuesday that its artillery and rocket forces are at their highest-level combat posture in the latest in a string of bellicose threats aimed at South Korea and the United States.

The announcement came as South Koreans marked the third anniversary of the sinking of a warship in which 46 South Korean sailors died. Seoul says the ship was hit by a North Korean torpedo. The North denies involvement.

Seoul’s Defense Ministry said Tuesday it hasn’t seen any suspicious North Korean military activity and that officials are analyzing the North’s warning.

Analysts say a direct North Korean attack is extremely unlikely, especially during joint U.S.-South Korean military drills that end April 30.

North Korea, angry over routine U.S.-South Korean drills and recent U.N. sanctions punishing it for its Feb. 12 nuclear test, has vowed to launch a nuclear strike against the U.S. and repeated its two-decade-old threat to reduce Seoul to a “sea of fire.” Despite the rhetoric, outside weapons analysts have seen no proof North Korea has mastered the technology needed to build a warhead small enough to mount on a missile.

A United Airlines pilot admits he stood naked in the window of his 10th-floor room at the Westin Hotel at Denver International Airport, but says he had no idea he was visible to anyone inside the main terminal -- and he's horrified to now face a criminal charge of indecent exposure.

A 27-year-old man has been arrested for investigation of first-degree murder after he allegedly demanded money from an elderly disabled man near a Denver homeless shelter and then beat and strangled the man to death.